CVE-2026-100527

OpenClaw before 2026.8.2 contains a denial of service vulnerability in the Browser extension relay that allows unauthenticated network sources to exhaust pending-authentication capacity. Attackers can hold every pending slot by maintaining silent WebSocket upgrades, preventing paired extensions from completing Browser Relay Authentication v2.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-25)

CWE

CWE-400

Published

2026-09-26

Modified

2026-10-05

Record from

the NVD, synced 2026-10-19

References

• https://github.com/openclaw/openclaw/security/advisories/GHSA-m78m-7h3q-q938
• https://www.vulncheck.com/advisories/openclaw-before-2026.8.2-denial-of-service-via-browser-relay

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